Patent GB-644785-A (GB)
Title: Improvements in or relating to a burner adapted to burn either liquid or gaseous fuel
IPC: F23D11/10
Filed: 1947-07-03
Abstract: 644,785. Spray burners. COMBUSTION RESEARCH & DEVELOPMENT, Inc. July 3, 1947, No. 17533. Convention date, July 10, 1946. [Class 75(i)] The invention concerns a burner adapted to burn a mixture of a liquid and a gaseous fuel and comprising a pair of concentric fuel supply members, the outer supply member conducting the fuel to a plurality of ports into which liquid fuel from the inner supply member is discharged through nozzles. The invention consists in that (a) the nozzles lead the liquid fuel either to the centres of the fuel streams through the ports or against walls where the direction of the fuel flow is changed before it enters the ports, the mixture thus formed being discharged in a whirling motion from the burner tip, or (b) the inner supply member is rotatable about its longitudinal axis and longitudinally movable and the nozzles discharge liquid fuel into connections between adjacent ports at points close to the walls of the connections. An inner supply tube 24 delivers oil through holes 38 to an inside annular groove 39 in a distributer head 18 which is provided with a plurality of ports 22 through which flows a fluid from the outer supply tube 10. The oil from the groove 39 is conducted into the enlarged lower sections of the ports 22 by threaded jets 41 which protrude into the centres of the ports. Slots in the ends of the jets to facilitate screwing the jets into the walls of the distributer head are preferably arranged parallel to the axis of the burner. The distributer head is screwed into a sleeve 12 which is screwed on to the outer supply tube 10. The lower bevelled end of the sleeve 12 co-operates with the inner surface of the mushroom-shaped lower end 26 of the inner supply tube 24 and has grooves 27 disposed tangentially to the circle of the ports 22 and serving as outlets for the fuel mixture. The inner supply tube 24 is a sliding fit in a central bore in a guide member 28 welded to the top of the outer supply tube 10 and is supplied with oil by a pipe 34 which is secured to the wall of the guide member 28 and communicates with a cylindrical lantern ring 32 disposed around the supply tube 24 at an enlarged part of the central bore in the guide member; holes 36, 37 are provided in the wall of the lantern ring and in the supply tube 24 for the passage of oil. The upper end of the inner supply tube 24 is secured to a member 47 having a threaded collar 48 for adjusting the tension of a spring 44 disposed between the collar and a member 43 which compresses packing glands 31 fitted above and below the lantern ring 32. The spring 44 urges the inner supply tube 24 upwardly to keep its lower end in contact with the sleeve 12 but allows manual rotation and displacement of the inner tube to facilitate cleaning the grooves 27 in the sleeve 12. Fluid is delivered to the outer supply tube 10 by a pipe 11 secured thereto. In the embodiment shown in Figs. 4, 5, the distributer head 52 is screwed directly on to the lower end of the outer supply tube and the fluid ports 54 are of uniform diameter and are inclined to the axis of the burner. Holes 55 are drilled radially into the distributer head to join adjacent ports in pairs and oil from an annular groove 57 surrounding the inner supply tube is conducted along ducts 58 which enter the spaces joining each pair of ports at points opposite plugs 59 screwed into the bores 55.